No crank no start issue?

BSTOCK1965

MEMBER
2007 CHEVROLET SILVERADO
5.3L
V8
2WD
AUTOMATIC
240,000 MILES

I have no power door locks, key fob won't work, no radio, no dome lights, no high beams etc, and no crank. I have power going to start relay. Jumped at the relay and it did engage starter. I've checked all the grounds and all the fuses, and they are all good. The security pass lock does show when I turn the key but goes out. Also showing random warning lights. From what I have read it is pointing to the BCM. But am I missing something else to check?

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,663 POSTS

Yep, I would say BCM as well but to be sure we should perform a CAN scan which is easy to do. You can get a CAN scanner (Controller Area Network) from Amazon for about $36.00.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Amazon CAN scanner link for about $35.00:

https://amzn.to/3R9lJ60

Here is how to change out the BCM in case you need it. You can get a rebuild preprogrammed BCM if you search google or eBay. Check out the images (below). Let us know what happens and please upload pictures or videos of the problem.

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Monday, October 24th, 2022 AT 9:00 AM

BSTOCK1965

MEMBER
2 POSTS

Thanks for the response, it was in fact the BCM and I got to tell you next time I'm just going to pay someone to come to my house and scan it. I frustrated myself with the amount of time I spent testing tracking wires to the best of my abilities. But again, thanks for the response.

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Monday, October 24th, 2022 AT 10:17 AM

KEN L

MASTER CERTIFIED MECHANIC
47,663 POSTS

Scanning codes is easier than ever now. You can get a CAN scanner (Controller Area Network) from Amazon for about $36.00.

Here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Amazon CAN scanner link for about $35.00.

https://amzn.to/3R9lJ60

Use it for next time or when any problems come up. Use 2CarPros anytime, we are here to help. Please tell a friend.

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Tuesday, October 25th, 2022 AT 1:42 PM